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Even though bandwith increases, website optimization is a bigger issue then ever. Mobile devices don't benefit from modern fiber lanes and web applications get more complex and require more and more ressources to load.

In different articles we talked already about performance improvements in PHP and Javascript but what if they are already fast?

It is very common that, especially on simple sites, the most time is not spent on processing on the server but on the data transfer itself. Connecting to the Server, downloading the HTML, downloading Javascript and CSS ressources, downloading images...Additionaly loaded ressources may load additionally ressources which couldn't be loaded before (cause they where unknown), making the load even longer.

There are a bunch of books, articles and tutorials out there describing possible improvements as well as tools analyzing it but gooing through all the items takes time...